A £2m windfall received by the Prince's Trust has become the charity's biggest donation from an individual.
Conservative peer Lord Laidlaw of Rothiemay pledged the money over two years to help 3,000 young people start up in business. The gift, in the charity's 30th year, will complement the work of Laidlaw's own charity in Scotland.
"We couldn't ask for a more fantastic birthday gift," said Carol Homden, commercial director of the trust.
Laidlaw is keen for his donation to be used to lever further donations.
"We will report back to Lord Laidlaw and take his guidance and advice on how the gift is used," said Homden.
The largest previous donation was made this spring by Peter Cruddas, who donated £1.5m.
DAME ANITA RODDICK - Donated £1m to Amnesty International in 2004
DAVID GILMOUR - The Pink Floyd guitarist donated £3.6m to Crisis in 2003
SIR TOM HUNTER - The Sports Division founder has given away much of his personal wealth, estimated at £780m in 2005, including a £6m donation to Band Aid and £1m to Make Poverty History.